Breaking Bad: Parallel Subtitles Corpora and the Extraction of Verb-Particle Constructions

The automatic extraction of verb-particle constructions (VPCs) is of particular interest to the NLP community. Previous studies have shown that word alignment methods can be used with parallel corpora to successfully extract a range of multi-word expressions (MWEs). In this paper the method is applied to a new type of corpus, made up of a collection of subtitles of films and television series. Building on previous research, it is shown that a precision level of 94 ± 4.7% can be achieved in VPC extraction. This high level of precision is achieved despite the difficulties of aligning and tagging subtitles data. Moreover, a significant proportion of the extracted VPCs are not present in online lexical resources, highlighting the benefits of using this unique corpus type, which contains a large number of slang and other informal expressions. An added benefit of using the word alignment process is that translations are also automatically extracted for each VPC. A precision rate of 79.8 ± 8.1% is found for the translations of English VPCs into Spanish. This study thus shows that VPCs are a particularly good subset of the MWE spectrum to attack using word alignment methods, and that subtitles data provide a range of interesting expressions that do not exist in other corpus types.